Windows 11 will randomly freeze (hard lock) monitor will not update, keyboard lock out, mouse locked out - forcing hard boot.

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Random hard freezes on Windows 11 are typically caused by faulty drivers, hardware issues, or low‑level software (such as security tools) interacting badly with the system. Since diagnostics and peripheral removal have already been tried and only one of several identical systems is affected, focus should be on isolating the specific driver or software component on that machine and collecting data when the freeze occurs.

Follow these steps on the affected PC:

1. Apply basic Windows 11 stability checks
   1. Make sure all Windows Updates are installed: Start > Settings > Windows Update > Check for updates.
   2. Check Device Manager for driver issues:
      • Right‑click Start > Device Manager.
      • Look for any device with an exclamation mark (!).
      • For any such device, right‑click > Update driver. If that does not help, temporarily Disable or Uninstall the device and test.
   3. Ensure there is sufficient free disk space on the system drive (at least 10–15% free) so Windows can create paging and temporary files reliably.
2. Test in Safe Mode
   1. Boot into Safe Mode as described in Start your PC in safe mode in Windows 11 (linked from the troubleshooting article).
   2. Use the PC in Safe Mode for as long as practical.
      • If freezes do not occur in Safe Mode, this strongly points to a third‑party driver or software (including security software) loaded only in normal mode.
3. Collect data when the system freezes To move beyond guesswork, configure the system to generate a complete memory dump when it locks, so the root cause (driver, kernel component, or hardware) can be analyzed.
   1. Configure a complete memory dump:
      • Press Win + R, type Sysdm.cpl, press Enter.
      • Go to Advanced tab > Performance > Settings > Advanced.
      • Select Change and verify there is a paging file on the system drive that is at least 100 MB larger than installed RAM, and that the system drive has more free space than the amount of RAM.
      • Back in System Properties, under Startup and Recovery, select Settings.
      • Under Write debugging information, choose Complete memory dump.
      • Check Overwrite any existing file.
   2. Enable keyboard‑triggered crash to capture a dump when the system is frozen:
      • Open Registry Editor.
      • Go to:
        • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters
        • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\kbdhid\Parameters
      • In each key, create a REG_DWORD value named CrashOnCtrlScroll and set it to 1.
      • Restart the computer.
      • When the system hard‑freezes (screen and input unresponsive), press Right Ctrl + Scroll Lock twice. This forces a crash and generates a memory dump that can be analyzed to identify the offending driver or component.
4. If freezes persist and dumps implicate drivers For advanced analysis or if a specific driver is suspected, Driver Verifier and I/O Verification can be used to stress and validate drivers:
   • Use verifier.exe with the I/O Verification option (Bit 4 / 0x10) for specific suspect drivers, for example:

          verifier /flags 0x10 /driver MyDriver.sys
     

   • Reboot and reproduce the issue; if a driver bug is present, the system will bug‑check with a more informative stop code instead of silently freezing.
   • This is an advanced step and should be used only when comfortable with debugging and after ensuring memory dump collection is configured.
5. If no clear cause is found If, after applying updates, checking drivers, testing in Safe Mode, and collecting dumps, the system remains unstable while other identical systems are stable, consider a repair‑level action on that one machine:
   • Use Windows 11 recovery options (for example, System Restore if a suitable restore point exists, or other recovery options) while choosing the option that preserves personal files where possible.

These steps will either stop the freezes (if caused by a driver or configuration issue) or provide the data needed to identify the exact failing component.

References:

• Troubleshooting Windows unexpected restarts and stop code errors
• Advanced troubleshooting for Windows freezes
• I/O Verification